You stated you only leave a bottle 2 days a week. So on the other days, you expect your dd not to have anything to eat or drink while she is there? I don't know what else you expected your babysitter to do. If you didn't leave a bottle of bm and the baby is hungry, then you didn't really leave her an alternative. If you feel so strongly about formula, then you need to make sure the sitter has something to feed the baby EVERY day she is there. It sounds like she was trying really hard to make your baby happy. She tried to call you first and you didn't answer. That put her in a tough position to make a decision on what to do next since she was unable to get ahold of you. She had no way of knowing you were on your way. I would not leave her over this.